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In page Chiasmal syndrome:

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Because macular fibers cross more posteriorly in the chiasm, they are damaged in posterior chiasmal syndrome. This leads to a smaller, paracentral bitemporal field loss. Because the temporal macular fibers have not been damaged, it is possible to preserve color vision and visual acuity. Posterior lesions may also involve the optic tract and cause a contralateral homonymous hemianopia.[citation needed]